And not to sound racist, but black people have (often) very different stench from the rest, that one is not Chinese (racist) myth.
But to be honest every race/nation I met stink, your nose is just blind to the people you meet most often. It's same with my apartment when I return back after longer vacation I can notice its specific (new) smell still even after years living there (especially if I won't leave windows a bit open for air exchange), but if I'm away just for a day or two I don't smell anything.